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Modulus Arms Jigs & Bits

We carry all the Modulus Arms jigs and parts for fabricating your own 80% lowers. These 80% lower Modulus Arms jigs are universal, featuring standardized dimensions to locate and center your template with high accuracy and safer, faster machining. Our selection of Modulus Arms jig parts feature bits that are solid carbide end mill, designed to work specifically with Modulus Arms jigs and prevent melted or worn out templates. Shop with RightToBear.com today and receive free shipping on select orders of Modulus Arms jigs and parts.